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V.
Supervision of measures directed against malaria at Shing Mun, Patheung, Kai Tak, Shek O, Tytam Tuk, and Repulse Bay.
VI.
Local surveys for the abatement of mosquito nuisances and the supervision of anti-mosquito measures affecting Shek O, Repulse Bay, Mount Kellett, Pokfulam, and Kai Tak Aerodrome.
VII.
The teaching of mosquitology and the instruction of inspectors in this work and other matters bearing on the subject.
VIII.
Co-operation with Government Departments, the Military, Naval, and Air Force, public companies and private individuals in the investigation and eradication of malaria.
I. MALARIA AND MOSQUITO BORNE DISEASES.
Malaria.
4. The important vectors in the Colony are A. minimus, and A. jeyporiensis var. candidiensis. As in former years, infections were encountered in A. hyrcanus var. sinensis, and in A. maculatus in the Shing Mun dissections.
5. In 1985 A. minimus, A. jeyporiensis and A. maculatus were experimentally infected with sub-tertian malaria at the Bureau.
6. Attempts to infect A. hyrcanus did not succeed. It is noteworthy that out of three A. minimus, four A. maculatus, seven A. hyrcanus fed upon the same patient, at the same time under the same conditions, one A. minimus, two A. maculatus became infected, but none of the A. hyrcanus.
7. In areas where the masses of the population reside, extensive training of hill streams has been carried out, and in consequence as a rule there are no facilities for the breeding of Anophelines, but where such exist as in suburban and rural areas on the Island and mainland, the possibility of malaria must always be reckoned with.
8. The bulk of the malaria appears to be caused by Anophelines breeding in hilly country—(a) in fallow rice fields, (b) in rice cultivation during October and November, (c) in the hilly portion of certain hill streams, and (d) in irrigation ditches.
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